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In the observable universe there are about 80 to 100 billion galaxies with varying numbers of stars in each. A rough mean average for the number of stars per galaxy is 400 billion. It is thought that there are from 30 to 70 billion trillion (i.e. 30 to 70 sextillion) stars in the observable universe. Whilst the estimates differ somewhat, the number of stars seems to be in the sextillions, which is a 1 followed by 21 zeros.

There are many reasons why our estimates vary as much as they do. An important point to consider is that when we observe distant objects such as stars, we don't see them as they are now, but as they were in the past. The reason we see into the past as we look out into the universe is because the light we see takes a finite amount of time to reach us. As such, some of the stars we see, particularly those in very distant regions of space (relative to earth), may no longer be counted as stars. Conversely, new stars in distant regions may have already formed but we wouldn't see them until light from those stars reaches us here on earth.

In the observable universe there are about 10 billion galaxies.Assuming galaxies have an average of 100 billion stars each, theobservable universe has about 1 billion trillion… stars (or1,000,000,000,000,000,000,000).

The most recent estimates place the number of stars in the observable universe at around 1023. That's a 1 with twenty-three zeros after it. More precisely, that would be 100 s…extillion. "The universe is so big, it doesn't even make sense to talk about how big it is."

Nobody can really tell. There are an estimated 100,000,000,000,000,000,000 (100 quintrillion) probably more. Of those it's estimated to be about 3,000,000,000,000,000 (3 tho…usand trillion) will be hypergiants.

Mitchell Bradner

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I'm a college student who is on my way to graduate. I know quite a bit about Star Wars and often answer questions in the Star Wars category.

Answer 1: Hundreds of billions of billions. Updated: As of 2009, it was estimated to be around 1023 stars in the observable universe. However, it was recently discovered… that we may have been missing most stars of the red dwarf variety and now it is beginning to look like the 1023 figure would now have to be tripled. So its about.... 3,000,000,000,000,000,000,000,000

We can't be sure, and we don't even have any good guesses. The current best guess was just recently revised by a factor of three, tripling the number of stars in the universe …to 300 sextillion, or 300,000,000,000,000,000,000,000. The problem is that there are probably more stars even than that, because so many of them (and we CANNOT KNOW how many!) are small, dim red dwarf and brown dwarf stars, which cannot be seen even up close.

What a great question! The Milky Way galaxy, of which the Sun is a part, has approximately one hundred billion stars. Keep in mind that stars and being created and destroyed a…ll the time. As to how many galaxies there are, and a rough estimate of how many stars, it is hard to say because not all of the universe, such as it is, has been observed, and hypotheses vary wildly, so any guess is probably not helpful.

Carl Sagan used to say, "there are 100 billion galaxies each with 100 billion suns." 100 billion x 100 billion = 1022 Although today, many scientists estimate that number to… be even larger still. There is no way of knowing as our understanding of the universe is still very small. It's like asking how many grains of sand there are on the Earth surface, it would be impossible to give an exact number. Funny enough, some say that the number of stars actually exceeds the number of grains of sand!

We guess. Really. There's no way to actually COUNT the stars in the Milky Way; the small ones are too small and dim to see if they are more than a few dozen light years away…. So we make estimates, which are little better than guesses.

The answer has to be estimated; for many reasons no one can ever know the exact numbers, whatever that might mean in this context. Estimates of the number of galaxies in the u…niverse range from about 170 billion to one trillion. One trillion is one thousand millions. Estimates of the number of stars range from around 70 sextillion to 300 sextillion. Seventy sextillion is 7 followed by 22 zeros. 300 sextillion is 3 followed by 23 zeros. Some estimate as high as 10 to the power 24, which is one followed by 24 zeros. You might think that 22, 23 and 24 are small numbers here, until you begin to consider that every single one of them represents a power of ten. The number is far beyond anything that any human mind can grasp on anything close to a practical level.

If the big-bang theory is true, the stars, planets, and other universal bodies were progressively formed, so there were much less stars than we have today, and the fomation of… new stars is compensated by the death of others.

There is no real count because new stars are created from time to time. There are BILLIONS AND BILLIONS (as Carl Sagan might have said). There are billions of stars in our Gal…axy and there are billions of galaxies. We don't have a very precise total. The usual estimate is: at least ten thousand billion billion. That's 1022 in scientific notation.